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y in (-oo:+oo)
y^2 = 9/25 // - 9/25
y^2-(9/25) = 0
y^2-9/25 = 0
1*y^2 = 9/25 // : 1
y^2 = 9/25
y^2 = 9/25 // ^ 1/2
abs(y) = 3/5
y = 3/5 or y = -3/5
y in { 3/5, -3/5 }
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